Check button from another ViewController - ios

Question

I'm trying to an event application. I can add events to Firebase database and retrieve them. When I click the add button from my viewController, event's informations adding to Firebase database. But it can't show on my tableViewController until I logged out and log in again.
Here my retrieve code:
private func loadPlaces() {
let ref = FIRDatabase.database().reference()
ref.child("posts").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in
let images = snapshot.value as! [String : AnyObject]
// self.places.removeAll()
for (_, value) in images {
let userToShow = events()
if let img = value["pathToImage"] as? String,
let eventDate = value["event date"] as? String,
let name = value["event name"] as? String
//let information = value["information"] as? String
{
// self.places.append(historicalPlaces(img: img , name: name2, inf:information))
userToShow.eventImages = img
userToShow.eventDates = eventDate
userToShow.eventnames = name
// userToShow.information = information
self.event.append(userToShow)
}
}
self.tableView.reloadData()
})
// ref.removeAllObservers()
}
and this is my uploadPost code:
import UIKit
import os.log
import Firebase
class UploadPost: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
#IBOutlet weak var eventImage: UIImageView!
#IBOutlet weak var selectImageBtn: UIButton!
#IBOutlet weak var eventName: UITextField!
#IBOutlet weak var eventInf: UITextView!
#IBOutlet weak var addBtn: UIButton!
#IBOutlet weak var eventDate: UITextField!
#IBOutlet weak var addEvent: UIBarButtonItem!
var picker = UIImagePickerController()
let datePicker = UIDatePicker()
override func viewDidLoad() {
super.viewDidLoad()
picker.delegate = self
createDatePicker()
}
func createDatePicker(){
//format for picker
datePicker.datePickerMode = .dateAndTime
// toolbar
let toolbar = UIToolbar()
toolbar.sizeToFit()
// bar button item
let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(donePressed))
toolbar.setItems([doneButton], animated: false)
eventDate.inputAccessoryView = toolbar
//assigning date picker to text field
eventDate.inputView = datePicker
}
func donePressed(){
//format date
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .short
dateFormatter.timeStyle = .short
eventDate.text = dateFormatter.string(from: datePicker.date)
self.view.endEditing(true)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let image = info[UIImagePickerControllerEditedImage] as? UIImage {
self.eventImage.image = image
selectImageBtn.isHidden = true
addBtn.isHidden = false
}
self.dismiss(animated: true, completion: nil)
}
#IBAction func selectImage(_ sender: Any) {
picker.allowsEditing = true
picker.sourceType = .photoLibrary
self.present(picker, animated: true, completion: nil)
}
#IBAction func addEventPressed(_ sender: Any) {
}
#IBAction func addPressed(_ sender: Any) {
AppDelegate.instance().showActivityIndicator()
let uid = FIRAuth.auth()!.currentUser!.uid
let ref = FIRDatabase.database().reference()
let storage = FIRStorage.storage().reference(forURL: "gs://bauventdemo.appspot.com")
let key = ref.child("events").childByAutoId().key
let imageRef = storage.child("events").child(uid).child("\(key).jpg")
let data = UIImageJPEGRepresentation(self.eventImage.image!, 0.6)
let uploadTask = imageRef.put(data!, metadata: nil) { (metadata, error) in
if error != nil {
print(error!.localizedDescription)
AppDelegate.instance().dismissActivityIndicatos()
return
}
imageRef.downloadURL(completion: { (url, error) in
if let url = url {
let feed = ["userID" : uid,
"pathToImage" : url.absoluteString,
"event name" : self.eventName.text!,
"event date" : self.eventDate.text!,
"author" : FIRAuth.auth()!.currentUser!.displayName!,
"event information" : self.eventInf.text!,
"postID" : key] as [String : Any]
let postFeed = ["\(key)" : feed]
ref.child("posts").updateChildValues(postFeed)
AppDelegate.instance().dismissActivityIndicatos()
self.dismiss(animated: true, completion: nil)
}
})
}
uploadTask.resume()
}
}
My code check database only when I login so, how can I check firebase database and retrieve them when I add new Event ?

Answer 1

The reason its not updating the table is because you are trying to reload the table in background thread.
Instead, reload it in the main thread. Like this:
DispatchQueue.main.async {
self.tableView.reloadData()
}
Updated code
private func loadPlaces() {
let ref = FIRDatabase.database().reference()
ref.child("posts").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in
let images = snapshot.value as! [String : AnyObject]
// self.places.removeAll()
for (_, value) in images {
let userToShow = events()
if let img = value["pathToImage"] as? String,
let eventDate = value["event date"] as? String,
let name = value["event name"] as? String
//let information = value["information"] as? String
{
// self.places.append(historicalPlaces(img: img , name: name2, inf:information))
userToShow.eventImages = img
userToShow.eventDates = eventDate
userToShow.eventnames = name
// userToShow.information = information
self.event.append(userToShow)
}
}
DispatchQueue.main.async {
self.tableView.reloadData()
}
})
// ref.removeAllObservers()
}

Answer 2

I tried add refresh button which retrieve data from database as a workaround.
#IBAction func refresh(_ sender: Any) {
loadPlaces()
}
and I put this code to prevent duplicate events.
self.event.removeAll()